From 81aa8efe0190cf5bf7eaafb57341cd7d0aea96cd Mon Sep 17 00:00:00 2001 From: Jens Freimann Date: Mon, 7 Oct 2013 16:13:44 +0200 Subject: KVM: s390: add and extend interrupt information data structs With the currently available struct kvm_s390_interrupt it is not possible to inject every kind of interrupt as defined in the z/Architecture. Add additional interruption parameters to the structures and move it to kvm.h Signed-off-by: Jens Freimann Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 34 +--------------------------------- 1 file changed, 1 insertion(+), 33 deletions(-) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index eef3dd3fd9a9..3ffc9646e742 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -168,18 +169,6 @@ struct kvm_vcpu_stat { u32 diagnose_9c; }; -struct kvm_s390_io_info { - __u16 subchannel_id; /* 0x0b8 */ - __u16 subchannel_nr; /* 0x0ba */ - __u32 io_int_parm; /* 0x0bc */ - __u32 io_int_word; /* 0x0c0 */ -}; - -struct kvm_s390_ext_info { - __u32 ext_params; - __u64 ext_params2; -}; - #define PGM_OPERATION 0x01 #define PGM_PRIVILEGED_OP 0x02 #define PGM_EXECUTE 0x03 @@ -188,27 +177,6 @@ struct kvm_s390_ext_info { #define PGM_SPECIFICATION 0x06 #define PGM_DATA 0x07 -struct kvm_s390_pgm_info { - __u16 code; -}; - -struct kvm_s390_prefix_info { - __u32 address; -}; - -struct kvm_s390_extcall_info { - __u16 code; -}; - -struct kvm_s390_emerg_info { - __u16 code; -}; - -struct kvm_s390_mchk_info { - __u64 cr14; - __u64 mcic; -}; - struct kvm_s390_interrupt_info { struct list_head list; u64 type; -- cgit v1.2.2 From c05c4186bbe4e99d64e8a36f7ca7f480da5d109f Mon Sep 17 00:00:00 2001 From: Jens Freimann Date: Mon, 7 Oct 2013 16:13:45 +0200 Subject: KVM: s390: add floating irq controller This patch adds a floating irq controller as a kvm_device. It will be necessary for migration of floating interrupts as well as for hardening the reset code by allowing user space to explicitly remove all pending floating interrupts. Signed-off-by: Jens Freimann Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/include/uapi/asm/kvm.h | 14 ++++++++++++++ 2 files changed, 15 insertions(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 3ffc9646e742..59635b5c59a6 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -243,6 +243,7 @@ struct kvm_arch{ struct sca_block *sca; debug_info_t *dbf; struct kvm_s390_float_interrupt float_int; + struct kvm_device *flic; struct gmap *gmap; int css_support; }; diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index d25da598ec62..38d5f98552bb 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -16,6 +16,20 @@ #define __KVM_S390 +/* Device control API: s390-specific devices */ +#define KVM_DEV_FLIC_GET_ALL_IRQS 1 +#define KVM_DEV_FLIC_ENQUEUE 2 +#define KVM_DEV_FLIC_CLEAR_IRQS 3 +/* + * We can have up to 4*64k pending subchannels + 8 adapter interrupts, + * as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. + * There are also sclp and machine checks. This gives us + * sizeof(kvm_s390_irq)*(4*65536+8+64*64+1+1) = 72 * 266250 = 19170000 + * Lets round up to 8192 pages. + */ + +#define KVM_S390_FLIC_MAX_BUFFER 0x2000000 + /* for KVM_GET_REGS and KVM_SET_REGS */ struct kvm_regs { /* general purpose regs for s390 */ -- cgit v1.2.2 From a91b8ebe8671980151e0a19ee9fec6b0e1ae1d58 Mon Sep 17 00:00:00 2001 From: Jens Freimann Date: Thu, 30 Jan 2014 08:40:23 +0100 Subject: KVM: s390: limit floating irqs Userspace can flood the kernel with interrupts as of now, so let's limit the number of pending floating interrupts injected via either the floating interrupt controller or the KVM_S390_INTERRUPT ioctl. We can have up to 4*64k pending subchannels + 8 adapter interrupts, as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. There are also sclp and machine checks. This gives us (4*65536+8+64*64+1+1) = 266250 interrupts. Suggested-by: Christian Borntraeger Signed-off-by: Jens Freimann Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/include/uapi/asm/kvm.h | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 59635b5c59a6..c3c5e1028136 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -214,6 +214,7 @@ struct kvm_s390_float_interrupt { unsigned long idle_mask[(KVM_MAX_VCPUS + sizeof(long) - 1) / sizeof(long)]; struct kvm_s390_local_interrupt *local_int[KVM_MAX_VCPUS]; + unsigned int irq_count; }; diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index 38d5f98552bb..058b178391d4 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -27,7 +27,7 @@ * sizeof(kvm_s390_irq)*(4*65536+8+64*64+1+1) = 72 * 266250 = 19170000 * Lets round up to 8192 pages. */ - +#define KVM_S390_MAX_FLOAT_IRQS 266250 #define KVM_S390_FLIC_MAX_BUFFER 0x2000000 /* for KVM_GET_REGS and KVM_SET_REGS */ -- cgit v1.2.2 From 24eb3a824c4f3ccfaa2305dc1d9d9e2a708828c5 Mon Sep 17 00:00:00 2001 From: Dominik Dingel Date: Mon, 17 Jun 2013 16:25:18 +0200 Subject: KVM: s390: Add FAULT_FLAG_RETRY_NOWAIT for guest fault In the case of a fault, we will retry to exit sie64 but with gmap fault indication for this thread set. This makes it possible to handle async page faults. Based on a patch from Martin Schwidefsky. Signed-off-by: Dominik Dingel Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/pgtable.h | 2 ++ arch/s390/include/asm/processor.h | 1 + 2 files changed, 3 insertions(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 2204400d0bd5..66101f6c6d81 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -767,6 +767,7 @@ static inline void pgste_set_pte(pte_t *ptep, pte_t entry) * @table: pointer to the page directory * @asce: address space control element for gmap page table * @crst_list: list of all crst tables used in the guest address space + * @pfault_enabled: defines if pfaults are applicable for the guest */ struct gmap { struct list_head list; @@ -775,6 +776,7 @@ struct gmap { unsigned long asce; void *private; struct list_head crst_list; + bool pfault_enabled; }; /** diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 0a876bc543d3..dc5fc4f90e52 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -79,6 +79,7 @@ struct thread_struct { unsigned long ksp; /* kernel stack pointer */ mm_segment_t mm_segment; unsigned long gmap_addr; /* address of last gmap fault. */ + unsigned int gmap_pfault; /* signal of a pending guest pfault */ struct per_regs per_user; /* User specified PER registers */ struct per_event per_event; /* Cause of the last PER trap */ unsigned long per_flags; /* Flags to control debug behavior */ -- cgit v1.2.2 From 3c038e6be0e299d4d3762d0a9a29f02de6e04991 Mon Sep 17 00:00:00 2001 From: Dominik Dingel Date: Mon, 7 Oct 2013 17:11:48 +0200 Subject: KVM: async_pf: Async page fault support on s390 This patch enables async page faults for s390 kvm guests. It provides the userspace API to enable and disable_wait this feature. The disable_wait will enforce that the feature is off by waiting on it. Also it includes the diagnose code, called by the guest to enable async page faults. The async page faults will use an already existing guest interface for this purpose, as described in "CP Programming Services (SC24-6084)". Signed-off-by: Dominik Dingel Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 22 ++++++++++++++++++++++ arch/s390/include/uapi/asm/kvm.h | 2 ++ 2 files changed, 24 insertions(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index c3c5e1028136..2c69ba285e81 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -231,6 +231,10 @@ struct kvm_vcpu_arch { u64 stidp_data; }; struct gmap *gmap; +#define KVM_S390_PFAULT_TOKEN_INVALID (-1UL) + unsigned long pfault_token; + unsigned long pfault_select; + unsigned long pfault_compare; }; struct kvm_vm_stat { @@ -257,6 +261,24 @@ static inline bool kvm_is_error_hva(unsigned long addr) return IS_ERR_VALUE(addr); } +#define ASYNC_PF_PER_VCPU 64 +struct kvm_vcpu; +struct kvm_async_pf; +struct kvm_arch_async_pf { + unsigned long pfault_token; +}; + +bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu); + +void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work); + +void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work); + +void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work); + extern int sie64a(struct kvm_s390_sie_block *, u64 *); extern char sie_exit; #endif diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index 058b178391d4..ccfd0b1d056d 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -20,6 +20,8 @@ #define KVM_DEV_FLIC_GET_ALL_IRQS 1 #define KVM_DEV_FLIC_ENQUEUE 2 #define KVM_DEV_FLIC_CLEAR_IRQS 3 +#define KVM_DEV_FLIC_APF_ENABLE 4 +#define KVM_DEV_FLIC_APF_DISABLE_WAIT 5 /* * We can have up to 4*64k pending subchannels + 8 adapter interrupts, * as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. -- cgit v1.2.2 From 536336c21697551ceca44bdffb9f53e6cc5f2f20 Mon Sep 17 00:00:00 2001 From: Dominik Dingel Date: Mon, 30 Sep 2013 10:55:33 +0200 Subject: KVM: async_pf: Exploit one reg interface for pfault To enable pfault after live migration we need to expose pfault_token, pfault_select and pfault_compare, as one reg registers to userspace. So that qemu is able to transfer this between the source and the target. Signed-off-by: Dominik Dingel Signed-off-by: Christian Borntraeger --- arch/s390/include/uapi/asm/kvm.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index ccfd0b1d056d..cb4c1eb8a0a5 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -73,4 +73,7 @@ struct kvm_sync_regs { #define KVM_REG_S390_EPOCHDIFF (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x2) #define KVM_REG_S390_CPU_TIMER (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x3) #define KVM_REG_S390_CLOCK_COMP (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x4) +#define KVM_REG_S390_PFTOKEN (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x5) +#define KVM_REG_S390_PFCOMPARE (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x6) +#define KVM_REG_S390_PFSELECT (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x7) #endif -- cgit v1.2.2